She needs no backstory. Treat her backstory as a mystery that the main characters want to find out. Just use it to build up Hype for her potential solo movie. Just introduce her as a Secretary under General Swanwick.

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What is the most indestructable thing in the avengers? Ironman's suit, Captain America's Shield, or Thor's Hammer?﻿ The correct answer is Hulk's Pants

That's not what he said and you damn well know it. They were saying that WW should be depicted as competent and capable and not oversexualized, not that she should be just like Faora. Honestly, I know that you don't like Snyder, but that statement just make you look bad since your clearly taking what the other poster said out of context to take another shot at Snyder.

What if at the end of the movie, Diana confesses to Kal-el that he is not the first Kryptonian on Earth? What if years ago the immortal Amazons left their immortal island in order to organize an excursion to investigate the mysterious Kryptonian spaceship, and--in the process--took a young Kara under their wing in order to train her and shroud her from a world that was not ready? I mean, there was an empty, open life pod in the "fortress of solitude."